Energy-filtered transmission electron microscopy (EFTEM) of intergrown pyroxenes
-
Kevin T. Moore
,
David C. Elber
Abstract
It is demonstrated that energy-filtered transmission electron microscope (EFTEM) imaging in a conventional TEM (CTEM), equipped with a field-emission gun (FEG) electron source, can be used to characterize the local chemical distribution in exsolved pyroxenes. EFTEM imaging, which can be performed in one to tens of minutes, yields two-dimensional compositional maps that can have nanometer- scale resolution. The combination of electron energy-loss spectroscopy (EELS) and EFTEM imaging with techniques such as bright-field and dark-field imaging, high-resolution TEM (HRTEM) imaging, energy-dispersive X-ray spectroscopy (EDS), and electron diffraction allows for the chemical and structural characterization of any sample able to withstand the electron beam.
EFTEM imaging, HRTEM, and EDS data suggest that the augite →orthopyroxene reaction in the samples examined occurs in two-steps; augite → pigeonite → orthopyroxene. In this two-step process, the chemical and structural components are accomplished separately, suggesting that it is energetically or kinetically favorable to dissociate the two components rather than have them occur simultaneously. This two-step transformation is supported by the pigeonite → orthopyroxene transformation, which appears to be an isothermal martensitic transformation since the pigeonite and orthopyroxene compositions are identical within analytical error.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Calcite inclusions in forsterite
- The induced thermoluminescence and thermal history of plagioclase feldspars
- Characterization and comparison of structural and compositional features of planetary quadrilateral pyroxenes by Raman spectroscopy
- A P21/c-C2/c high-pressure phase transition in Ca0.5Mg1.5Si2O6 clinopyroxene
- Energy-filtered transmission electron microscopy (EFTEM) of intergrown pyroxenes
- TEM analysis of microbial mediated sedimentation and lithification in modern marine stromatolites
- Mineralogy of a natural As-rich hydrous ferric oxide coprecipitate formed by mixing of hydrothermal fluid and seawater: Implications regarding surface complexation and color banding in ferrihydrite deposits
- A C/MoS2 mixed-layer phase (MoSC) occurring in metalliferous black shales from southern China, and new data on jordisite
- Step edges on galena (100): Probing the basis for defect driven surface reactivity at the atomic scale
- Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides
- Characterization of synthetic Cs-Li cancrinite grown in a butanediol-water system: An NMR spectroscopic and Rietveld refinement study
- Optical spectra of Co2+ in three synthetic silicate minerals
- Spectroscopic standards for four- and fivefold-coordinated Fe2+ in oxygen-based minerals
- Hydrous species in crystalline and metamict titanites
- First principles study of water adsorption on the (100) surface of zircon: Implications for zircon dissolution
- A molecular dynamics study of the glass transition in CaAl2Si2O8: Thermodynamics and tracer diffusion
- The crystal structure of aravaipaite
- Letter. Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica
Articles in the same Issue
- Calcite inclusions in forsterite
- The induced thermoluminescence and thermal history of plagioclase feldspars
- Characterization and comparison of structural and compositional features of planetary quadrilateral pyroxenes by Raman spectroscopy
- A P21/c-C2/c high-pressure phase transition in Ca0.5Mg1.5Si2O6 clinopyroxene
- Energy-filtered transmission electron microscopy (EFTEM) of intergrown pyroxenes
- TEM analysis of microbial mediated sedimentation and lithification in modern marine stromatolites
- Mineralogy of a natural As-rich hydrous ferric oxide coprecipitate formed by mixing of hydrothermal fluid and seawater: Implications regarding surface complexation and color banding in ferrihydrite deposits
- A C/MoS2 mixed-layer phase (MoSC) occurring in metalliferous black shales from southern China, and new data on jordisite
- Step edges on galena (100): Probing the basis for defect driven surface reactivity at the atomic scale
- Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides
- Characterization of synthetic Cs-Li cancrinite grown in a butanediol-water system: An NMR spectroscopic and Rietveld refinement study
- Optical spectra of Co2+ in three synthetic silicate minerals
- Spectroscopic standards for four- and fivefold-coordinated Fe2+ in oxygen-based minerals
- Hydrous species in crystalline and metamict titanites
- First principles study of water adsorption on the (100) surface of zircon: Implications for zircon dissolution
- A molecular dynamics study of the glass transition in CaAl2Si2O8: Thermodynamics and tracer diffusion
- The crystal structure of aravaipaite
- Letter. Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica
